Multifunction horniness metal screen capable of erase and write-in, nondust, projection of extinction facula distinctly and manufacturing method thereof

Abstract

This invention relates to one multi-function hard metal screen to erase words without dust, which is characterized by the following: the erase words without dust projects multi-function hard metal screen by use of cracker board as materials with positive surface with dark delustring surface with its back surface coated with high bright metal powder glue layer and protective layer to process multi-function hard metal screen through hard metal screen positive surface process and back surface process.

Description

technical field [0001] The invention belongs to a teaching tool involving multidisciplinary fields such as optics, chemistry, metallurgy, mechanics, physics, liquid interface, coating, polymer materials, etc., and particularly relates to a rewritable and dust-free extinction spot projection clear Multifunctional hard metal screen and manufacturing method thereof. Background technique [0002] At present, from the perspective of teaching forms at home and abroad, there are basically three kinds of teaching tools that are more common. These three forms are: 1. Traditionally, ordinary blackboards and chalks are used for teaching, including movable blackboards. There are: large dust, which affects the health of teachers; Because pure natural light irradiates the blackboard sometimes darker, students with poor eyesight often cannot see the handwriting on the blackboard clearly. 2. In recent years, projectors, projection screens, and CD-ROMs have been used for teaching, and there...

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the above-mentioned defects, and aims to solve: eliminate natural light and specular reflection phenomenon produced on the screen surface when the projector is projected; weaken the light spots produced on the screen surface during projection; improve the surface brightness of the screen during projection; the screen surface is resistant to scratches , use a whiteboard pen to write at will and erase it with an eraser at will, without leaving any traces, etc., providing a multi-functional hard metal screen that can replace various teaching tools and can be rewritten without dust and has a clear projection of extinction spots and its production method